Constant GIT_PATCH_BINARY 

pub const GIT_PATCH_BINARY: u16 = _; // 512u16

With TEXT, emit binary content as git’s GIT binary patch block instead of the Binary files … differ sentence — git’s --binary, under git’s own rule that it is asked for rather than assumed. A patch carrying a 40 MiB PNG is not what a review surface wants by default, and it is the difference between a patch git apply can replay and one it refuses.